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80+10x=70+12x
We move all terms to the left:
80+10x-(70+12x)=0
We add all the numbers together, and all the variables
10x-(12x+70)+80=0
We get rid of parentheses
10x-12x-70+80=0
We add all the numbers together, and all the variables
-2x+10=0
We move all terms containing x to the left, all other terms to the right
-2x=-10
x=-10/-2
x=+5
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